var Menu = Class.create();
Menu.prototype = {
	
	initialize: function(idOrElement, name, customConfigFunction){
		this.name = name;
		this.type = "menu";
		this.closeDelayTimer = null;
		this.closingMenuItem = null;

		this.config();
		if (typeof customConfigFunction == "function") {
			this.customConfig = customConfigFunction;
			this.customConfig();
		}
		this.rootContainer = new MenuContainer(idOrElement, this);
	},
	
	config: function(){
		this.collapseBorders = true;
		this.quickCollapse = true;
		this.closeDelayTime = 500;
	}
	
}

var MenuContainer = Class.create();
MenuContainer.prototype = {
	initialize: function(idOrElement, parent){
		this.type = "menuContainer";
		this.menuItems = [];
		this.init(idOrElement, parent);
	},
	
	init: function(idOrElement, parent){
		this.element = $(idOrElement);
		this.parent = parent;
		this.parentMenu = (this.type == "menuContainer") ? ((parent) ? parent.parent : null) : parent;
		this.root = parent instanceof Menu ? parent : parent.root;
		this.id = this.element.id;
		
		if (this.type == "menuContainer") {
			if (this.element.hasClassName("level1")) 
				this.menuType = "horizontal";
			else if (this.element.hasClassName("level2")) 
				this.menuType = "dropdown";
			else 
				this.menuType = "flyout";
			
			if (this.menuType == "flyout" || this.menuType == "dropdown") {
				this.isOpen = false;
				Element.setStyle(this.element, {
					position: "absolute",
					top: "0px",
					left: "0px"
					//display: "none"
				});
			} else {
				this.isOpen = true;
			}
		} else {
			this.isOpen = this.parentMenu.isOpen;
		}
		
		var childNodes = this.element.childNodes;
		if (childNodes == null) 
			return;
		
		for (var i = 0; i < childNodes.length; i++) {
			var node = childNodes[i];
			if (node.nodeType == 1) {
				if (this.type == "menuContainer") {
					if (node.tagName.toLowerCase() == "li") {
						this.menuItems.push(new MenuItem(node, this));
					}
				} else {
					if (node.tagName.toLowerCase() == "ul") {
						this.subMenu = new MenuContainer(node, this);
					}
				}
			}
		}
	},
	
	getBorders: function(element){
		var ltrb = ["Left", "Top", "Right", "Bottom"];
		var result = {};
		for (var i = 0; i < ltrb.length; ++i) {
			if (this.element.currentStyle) 
				var value = parseInt(this.element.currentStyle["border" + ltrb[i] + "Width"]);
			else if (window.getComputedStyle) 
				var value = parseInt(window.getComputedStyle(this.element, "").getPropertyValue("border-" + ltrb[i].toLowerCase() + "-width"));
			else 
				var value = parseInt(this.element.style["border" + ltrb[i]]);
			result[ltrb[i].toLowerCase()] = isNaN(value) ? 0 : value;
		}
		return result;
	},
	
	open: function(){
		if (this.root.closeDelayTimer) 
			window.clearTimeout(this.root.closeDelayTimer);
		this.parentMenu.closeAll(this);
		this.isOpen = true;
		if (this.menuType == "dropdown") {
			Element.setStyle(this.element, {
				left: (Position.positionedOffset(this.parent.element)[0]) + "px",
				top: (Position.positionedOffset(this.parent.element)[1] + Element.getHeight(this.parent.element)) + "px"
			});
			
		} else if (this.menuType == "flyout") {
			var parentMenuBorders = this.parentMenu ? this.parentMenu.getBorders() : new Object();
			var thisBorders = this.getBorders();
			if ((Position.positionedOffset(this.parentMenu.element)[0] + this.parentMenu.element.offsetWidth + this.element.offsetWidth + 20) >
			(window.innerWidth ? window.innerWidth : document.body.offsetWidth)) {
				Element.setStyle(this.element, {
					left: (-this.element.offsetWidth - (this.root.collapseBorders ? 0 : parentMenuBorders["left"])) + "px"
				});
			} else {
				Element.setStyle(this.element, {
					left: (this.parentMenu.element.offsetWidth - parentMenuBorders["left"] - (this.root.collapseBorders ? Math.min(parentMenuBorders["right"], thisBorders["left"]) : 0)) + "px"
				});
			}
			Element.setStyle(this.element, {
				top: (this.parent.element.offsetTop - parentMenuBorders["top"] - this.menuItems[0].element.offsetTop) + "px"
			});
		}
		//Effect.Appear(this.element, {duration:0.25});
		this.element.setStyle({display: 'block'});
	},
	
	close: function(){
		//Effect.Fade(this.element,{duration:0.25})
		this.element.setStyle({display: 'none'})
		this.isOpen = false;
		this.closeAll();
	},
	
	closeAll: function(trigger){
		for (var i = 0; i < this.menuItems.length; ++i) {
			this.menuItems[i].closeItem(trigger);
		}
	}
	
}

var MenuItem = Class.create();

Object.extend(Object.extend(MenuItem.prototype, MenuContainer.prototype), {
	initialize: function(idOrElement, parent){
		var menuItem = this;
		this.type = "menuItem";
		this.subMenu;
		this.init(idOrElement, parent);
		if (this.subMenu) {
			this.element.onmouseover = function(){
				menuItem.subMenu.open();
			}
		} else {
			if (this.root.quickCollapse) {
				this.element.onmouseover = function(){
					menuItem.parentMenu.closeAll();
				}
			}
		}
		var linkTag = this.element.getElementsByTagName("A")[0];
		if (linkTag) {
			linkTag.onfocus = this.element.onmouseover;
			this.link = linkTag;
			this.text = linkTag.text;
		}
		if (this.subMenu) {
			this.element.onmouseout = function(){
				if (menuItem.root.openDelayTimer) 
					window.clearTimeout(menuItem.root.openDelayTimer);
				if (menuItem.root.closeDelayTimer) 
					window.clearTimeout(menuItem.root.closeDelayTimer);
				eval(menuItem.root.name + ".closingMenuItem = menuItem");
				menuItem.root.closeDelayTimer = window.setTimeout(menuItem.root.name + ".closingMenuItem.subMenu.close()", menuItem.root.closeDelayTime);
			}
		}
	},
	
	openItem: function(){
		this.isOpen = true;
		if (this.subMenu) {
			this.subMenu.open();
		}
	},
	
	closeItem: function(trigger){
		this.isOpen = false;
		if (this.subMenu) {
			if (this.subMenu != trigger) 
				this.subMenu.close();
		}
	}
});


var menu;


function configMenu(){
	this.closeDelayTime = 600;
}

function initMenu(){
	menu = new Menu('root', 'menu', configMenu);
}


Event.observe(window, 'load', initMenu, false);